Maisie buys a bag of flour

She uses:
1/4 to bake a cake
2/5 to make a loaf

a) what fraction of flour was used?
b) what fraction of flour is left?

Your help would be very much appreciated.

3 answers

1/4 = 5/20
2/5 = 8/20

13/20 was used
How much is left
13/20 was used
3/20 was left over